Kenji Tanigaki (谷垣健治) is a Japanese action designer whose work includes Sha Po Lang, Flashpoint, the Rurouni Kenshin series, and Sakra. He talks about Japanese stunt history, the difference between Japanese and Hong Kong action, how he got his start in Hong Kong working with Donnie Yen, the difficulties of working in Japan on action films, and how his action design process has changed over time. You can see his IMDB here: https://www.imdb.com/name/nm0849459/